A manufacturer of thermostats uses a kanban system to control the flow of materials. The packaging center processes 10 thermostats an hour and receives completed thermostats every 30 minutes. Containers hold 5 thermostats each. (a) How many kanbans are needed for the packaging center? (Round your answer to 1 decimal place, the tolerance is +/-0.1.) (b) If management decides to keep two thermostats as safety stock, how many kanbans will be needed? (Round your answer to 1 decimal place, the tolerance is +/-0.1.)